| 2001 №08 (05) | 2001 №08 (07) |
The Paton Welding Journal, 2001, #8, 14-17 pages
Structure and properties of HAZ metal of low-alloyed pipe steels modified with calcium
I.V. Zakharova1, E.A. Chichkarey1, V.G. Vasiliev2, A.I. Trotsan3, A.Ya. Dejneka4, O.S. Kiryukhin4
1Priazovsky State Technical University, Mariupol, Ukraine2E.O. Paton Electric Welding Institute of the NASU 11 Kazymyr Malevych Str., 03150, Kyiv, Ukraine.
3T.N. Frantsevich Institute of Materials Science Problems, NASU, Kyiv, Ukraine
4OJSC «Kharkov Pipe Works», Kharkov, Ukraine
Abstract
Diagrams of anisothermal decay of austenite for 13G1SU, 09G2FB, 10G2FB steels, modified with calcium, are plotted by the method of dilatometric measurements. The changes in structure of low-alloyed pipe steels under the action of the welding thermal cycle are shown. The constants of the exponential functions to describe for the polymorphous transformations are determined, the parameters of empiric equation, relating the impact strength values with a phase composition of HAZ metal are evaluated. It was established that the cooling rate within the 600-500 oC interval for 13G1SU, 09G2FB, 10G2FB steels should be within 5-35 oC/s, while at strict requirements to the structure - 8.5-35.0 oC/s.
Keywords: heat-affected zone, cooling rate, samplessimulators, microstructure, impact strength, thermokinetic diagram, linear energy input, heat input
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